Re: [PATCH v2 3/3] tpm: vtpm_proxy: Add ioctl to request locality prepended to command

From	Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH v2 3/3] tpm: vtpm_proxy: Add ioctl to request locality prepended to command
Date	2017-05-09 01:50 +0200
Message-ID	<tF0zD-28N-3@gated-at.bofh.it> (permalink)
References	(3 earlier) <tDcbT-3QP-7@gated-at.bofh.it> <tDlfc-1wD-37@gated-at.bofh.it> <tDmXD-2GO-1@gated-at.bofh.it> <tDtZ8-7l4-13@gated-at.bofh.it> <tDvey-8iS-23@gated-at.bofh.it>
Organization	Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo

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On Thu, May 04, 2017 at 04:03:18PM -0400, Stefan Berger wrote:
> On 05/04/2017 02:40 PM, Jarkko Sakkinen wrote:
> > On Thu, May 04, 2017 at 07:14:27AM -0400, Stefan Berger wrote:
> > > On 05/04/2017 05:17 AM, Jarkko Sakkinen wrote:
> > > > On Wed, May 03, 2017 at 07:40:48PM -0400, Stefan Berger wrote:
> > > > > On 05/03/2017 06:37 PM, Jarkko Sakkinen wrote:
> > > > > > On Fri, Apr 28, 2017 at 09:02:18AM -0400, Stefan Berger wrote:
> > > > > > > Add an ioctl to request that the locality be prepended to every TPM
> > > > > > > command.
> > > > > > Don't really understand this change. Why locality is prenpended?
> > > > > Commands can be executed under locality 0-3 and for some commands it is
> > > > > important to know which locality a user may have chosen. How else should we
> > > > > convey that locality to the TPM emulator ?
> > > > Why this is not in the commit message?
> > > > 
> > > > More scalable way to do this would be to have a set of vtpm proxy
> > > > commands. There could be a command for requesting and releasing
> > > > locality. That would be more clean.
> > > I would think that if someone wanted to use locality it's the client using
> > > /dev/tpm(rm)0 calling an ioctl or so and the vtpm proxy then merely passing
> > > that locality to the backend (TPM emulator). I suppose the intention is to
> > > support something like that following the addition of the new functions
> > > request_locality and release_locality?
> > What if we later on want to pass something else than locality to the
> > backend? How that will work out?
> 
> 'push' more data in front. 'pop' off by recipient. We could wrap the command
> in some form.
> 
>     Stefan

I would find having a set of special commands cleaner. Prepending sounds
like a quick hack to me, not really something that should exist in the
mainline.

/Jarkko

Thread

[PATCH v2 3/3] tpm: vtpm_proxy: Add ioctl to request locality prepended to command Stefan Berger <stefanb@linux.vnet.ibm.com> - 2017-04-28 15:10 +0200
  Re: [PATCH v2 3/3] tpm: vtpm_proxy: Add ioctl to request locality  prepended to command kbuild test robot <lkp@intel.com> - 2017-04-29 09:10 +0200
  Re: [PATCH v2 3/3] tpm: vtpm_proxy: Add ioctl to request locality  prepended to command Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-05-04 00:40 +0200
    Re: [PATCH v2 3/3] tpm: vtpm_proxy: Add ioctl to request locality  prepended to command Stefan Berger <stefanb@linux.vnet.ibm.com> - 2017-05-04 01:50 +0200
      Re: [PATCH v2 3/3] tpm: vtpm_proxy: Add ioctl to request locality  prepended to command Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-05-04 11:30 +0200
        Re: [PATCH v2 3/3] tpm: vtpm_proxy: Add ioctl to request locality  prepended to command Stefan Berger <stefanb@linux.vnet.ibm.com> - 2017-05-04 13:20 +0200
          Re: [PATCH v2 3/3] tpm: vtpm_proxy: Add ioctl to request locality  prepended to command Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-05-04 20:50 +0200
            Re: [PATCH v2 3/3] tpm: vtpm_proxy: Add ioctl to request locality  prepended to command Stefan Berger <stefanb@linux.vnet.ibm.com> - 2017-05-04 22:10 +0200
              Re: [PATCH v2 3/3] tpm: vtpm_proxy: Add ioctl to request locality  prepended to command Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-05-09 01:50 +0200
                Re: [PATCH v2 3/3] tpm: vtpm_proxy: Add ioctl to request locality  prepended to command Stefan Berger <stefanb@linux.vnet.ibm.com> - 2017-05-09 17:50 +0200
                Re: [PATCH v2 3/3] tpm: vtpm_proxy: Add ioctl to request locality  prepended to command Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-05-10 15:00 +0200
                Re: [PATCH v2 3/3] tpm: vtpm_proxy: Add ioctl to request locality  prepended to command Stefan Berger <stefanb@linux.vnet.ibm.com> - 2017-05-10 15:30 +0200
                Re: [PATCH v2 3/3] tpm: vtpm_proxy: Add ioctl to request locality  prepended to command Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-05-10 20:40 +0200

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